From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Valve clearances, gasket settling, and the re-fitting of gaskets on 20 HP engines.
Identifier | ExFiles\Box 8\4\ 04-page111 | |
Date | 29th October 1928 | |
To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to Hs.{Lord Ernest Hives - Chair} c.c. E.E.P. Mx.{John H Maddocks - Chief Proving Officer} Hm{Capt. W. Hallam - Head Repairs} f615 Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}/LG29.10.28. 20 HP. VALVES. y5060 With reference to E1/M10.10.28. We agree that in the case of 12-G-4 the cause of the valve clearance being taken up would be the settling down of the gasket. We have made enquiries and find that a new gasket had been fitted just prior to the car leaving the Works. The clearance of the valves had been checked and set to - Inlet .004" the previous day. E xhaust .006" We agree that it is not necessary to change a gasket every time a cyl. head is taken off. We have during our 10,000 miles tests in France had numerous occasions when the cyl. head was taken off and re-fitted using the same gasket in each case, and we have not had any trouble with water leaks etc. There are occasions when the gasket becomes damaged in dismantling. We have found that after two or three days running with a new gasket fitted it is necessary to check the valve clearances also cyl. nuts. We have just completed a test of a weeks running checking the valve clearances each day, with very even results. We do not think it would be wise to advocate the use of graphite grease as there is a great danger of too liberal use of it. We prefer smearing the gasket with oil. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||